Solar panel usable on a refrigeration unit



FIG. 1 is a perspective view of a solar panel usable on a refrigeration unit, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown represent environmental subject matter and form no part of the claimed design. 

CLAIM We claim, the ornamental design for a solar panel usable on a refrigeration unit, as shown and described. 